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Mid-infrared two photon absorption sensitivity of commercial detectors
We report on broad-band two-photon absorption (TPA) in several commercially available MIR inter-band bulk semiconductor photodetectors with the spectral cutoff in the range of 4.5-6 mu m. The highest TPA responsivity of 2 x 10(-5) A.mm(2)/W-2 is measured for a nitrogen-cooled InSb photovoltaic detector. Its performance as a two-photon detector is validated by measuring the second-order interferometric autocorrelation function of a multimode quantum cascade laser emitting at the wavelength of 8 mu m. Published by AIP Publishing.

Authors: D. L. Boiko, A. V. Antonov, D. I. Kuritsyn, A. N. Yablonskiy, S. M. Sergeev, E. E. Orlova, et al.

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